Question: Give the end time for lower Saxony has head of government as Christian Wulff?
Paraphrase: Give the conclusion time for lower Saxony has head of government as Christian Wulff?
SPARQL (Wikidata): SELECT ?value WHERE { wd:Q1197 p:P6 ?s . ?s ps:P6 wd:Q2540 . ?s pq:P582 ?value}